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Bank Loans (Aging Of The Recorded Investment In Past Due Loans) (Details) - USD ($) | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | $ 24,061,000 |  | $ 12,612,000 |
Total |  | 20,532,967,000 |  | 20,602,558,000 |
Non-Accrual |  | 10,061,000 | [1] | 10,102,000 | [2]
Restructured |  | 148,000 | [1] | 150,000 | [2]
Nonperforming loans with no allowance |  | 1,211,000 | [1] | 0 | [2]
Total |  | 11,420,000 | [1] | 10,252,000 | [2]
Loans past due 90 days and still accruing interest |  | 0 |  | 0 |
30 - 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 12,789,000 |  | 2,510,000 |
90 or More Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 11,272,000 |  | 10,102,000 |
Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 20,508,906,000 |  | 20,589,946,000 |
Residential Real Estate [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 14,537,000 |  | 3,133,000 |
Total |  | 7,708,506,000 |  | 7,371,671,000 |
Non-Accrual |  | 1,032,000 | [1] | 870,000 | [2]
Restructured |  | 148,000 | [1] | 150,000 | [2]
Nonperforming loans with no allowance |  | 927,000 | [1] | 0 | [2]
Total |  | 2,107,000 | [1] | 1,020,000 | [2]
Residential Real Estate [Member] | 30 - 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 12,578,000 |  | 2,445,000 |
Residential Real Estate [Member] | 90 or More Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 1,959,000 |  | 688,000 |
Residential Real Estate [Member] | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 7,693,969,000 |  | 7,368,538,000 |
Commercial and Industrial [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 8,883,000 |  | 9,226,000 |
Total |  | 4,471,031,000 |  | 4,897,176,000 |
Non-Accrual |  | 8,883,000 | [1] | 9,226,000 | [2]
Total |  | 8,883,000 | [1] | 9,226,000 | [2]
Commercial and Industrial [Member] | 30 - 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 0 |  | 0 |
Commercial and Industrial [Member] | 90 or More Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 8,883,000 |  | 9,226,000 |
Commercial and Industrial [Member] | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 4,462,148,000 |  | 4,887,950,000 |
Fund Banking [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 4,349,541,000 |  | 4,182,641,000 |
Fund Banking [Member] | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 4,349,541,000 |  | 4,182,641,000 |
Securities-Based Loans [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total |  | 2,399,328,000 |  | 2,724,551,000 |
Securities-Based Loans [Member] | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 2,399,328,000 |  | 2,724,551,000 |
Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  |  |  | 0 |
Total |  | 677,521,000 |  | 675,599,000 |
Commercial Real Estate [Member] | 90 or More Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  |  |  | 0 |
Commercial Real Estate [Member] | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 677,521,000 |  | 675,599,000 |
Construction And Land [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  |  |  | 0 |
Total |  | 772,571,000 |  | 593,191,000 |
Construction And Land [Member] | 90 or More Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  |  |  | 0 |
Construction And Land [Member] | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 772,571,000 |  | 593,191,000 |
Home Equity Lines Of Credit [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 587,000 |  | 211,000 |
Total |  | 110,766,000 |  | 107,136,000 |
Non-Accrual | [1] | 116,000 |  |  |
Nonperforming loans with no allowance | [1] | 281,000 |  |  |
Total | [1] | 397,000 |  |  |
Home Equity Lines Of Credit [Member] | 30 - 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 190,000 |  | 29,000 |
Home Equity Lines Of Credit [Member] | 90 or More Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 397,000 |  | 182,000 |
Home Equity Lines Of Credit [Member] | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 110,179,000 |  | 106,925,000 |
Other [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 54,000 |  | 42,000 |
Total |  | 43,703,000 |  | 50,593,000 |
Non-Accrual |  | 30,000 | [1] | 6,000 | [2]
Nonperforming loans with no allowance |  | 3,000 | [1] | 0 | [2]
Total |  | 33,000 | [1] | 6,000 | [2]
Other [Member] | 30 - 89 Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 21,000 |  | 36,000 |
Other [Member] | 90 or More Days Past Due [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 33,000 |  | 6,000 |
Other [Member] | Current Balance [Member] |  |  |  |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |  |  |  |
Total Past Due |  | $ 43,649,000 |  | $ 50,551,000 |
[1] | There were no loans past due 90 days and still accruing interest at June 30, 2023.
[2] | There were no loans past due 90 days and still accruing interest at December 31, 2022.

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